| 摘要 |
A crystalline molecular sieve with a mesoporous structure which has a large pore size, a thick thickness of a pore wall and improved hydrothermal stability, a preparation method of the crystalline molecular sieve, a catalyst for dearomatization of residue oil after naphtha cracking using the crystalline molecular sieve, and a method for preparing the catalyst using the crystalline molecular sieve are provided. A method for preparing a crystalline molecular sieve with a mesoporous structure comprises the steps of: (a) dissolving 1 to 30 weight parts of silica or aluminum salt, or a mixture of the silica or aluminum salt and a metal alkoxide selected from titanium alkoxide, aluminum alkoxide and silicon alkoxide into 100 weight parts of a hydrogen fluoride solution with a concentration of 10 to 60%, wherein the mixture has an Si/metal molar ratio of 5 to 100; (b) dissolving 2 to 30 weight parts of a mixture of a nonionic surfactant and trialkylbenzene into 100 weight parts of distilled water; (c) uniformly mixing the solution prepared in the step(a) with the solution prepared in the step(b) at a weight ratio of 1:0.5 to 2.0, adding 20 to 30 weight parts of ammonia water with a concentration of 20 to 30 wt.% relative to 100 weight parts of the hydrogen fluoride solution to the mixed solution, aging the resulting solution at 25 to 90 deg.C for 16 to 24 hours, and filtering and drying the aged solution to prepare powder; and (d) mixing the powder with 200 to 400 weight parts of an acidic ethanol solution in which an acid selected from hydrochloric acid, sulfuric acid and nitric acid is dissolved relative to 100 weight parts of the hydrogen fluoride solution to clean the powder prepared in the step(c), drying the cleaned powder, and calcining the dried powder at 300 to 600 deg.C. |
